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Q.

240 V, 200 W bulb is connected to a 210 V source. Determine the bulb's power consumption.

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a

110 W

b

115 W

c

120 W

d

153 W

answer is D.

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Detailed Solution

Electric Power: Electrical power, i.e. the rate at which electrical energy is converted into other kinds of energy

P=Wt=VI=I2R=V2R

Where V=  Potential difference, R=  Resistance, and I= current.

Given - Potential difference V= 240V, the power of the bulb P= 200W  and the actual voltage

V'=210 V

The calculation for the bulb's resistance is as follows:

R=V2P=(240)2200=288Ω

how much electricity the lightbulb uses.

P=V2R=(210)2288=153 W

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